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酸洗—还原浸出法从镍钴净化渣料中回收镍钴 刘文明1，唐新村1,2，汪洋1，晋媛1，王涛1，周乐1，吴仪娜1 （1.中南大学 化学化工学院，长沙 410083，2.中南大学 粉末冶金国家重点试验室，长沙 410083） 摘要：采用酸洗还原酸浸工艺回收某冶炼厂净化渣镍钴。重点讨论了酸洗终点pH和还原浸出过程中酸浓度、温度及时间、终点pH、液固比、还原剂用量对镍钴浸出率的影响。结果表明酸洗在终点pH2.5的条件下，镍的浸出率78.1%，而钴的浸出率极低。当还原酸浸出工艺在液固比101、酸浓度1.5 mol/L、时间3.0 h、温度60 ℃、还原剂用量1.0 m/g的条件下，镍和钴的浸出率分别达到98.3%和97.5%。 关键词：净化渣；还原浸出；镍；钴TF815；TF816 文献标志码：A 文章编号：1007-7545（2017）05-0000-00 Recovery of Nickel and Cobalt from Ni-Co-Bearing Purification Slag by Acid-Washing and Reduction Leaching LIU Wen-ming1, TANG Xin-cun1,2, WANG Yang1, JIN Yuan1, WANG Tao1, ZHOU Le1, WU Yi-na1 (1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China) Abstract：Nickel and cobalt were recovered from Ni-Co-bearing purification residues by acid-washing and reduction leaching. The effects of end point pH value during acid leaching and sulfuric acid content, leaching temperature and time, end point pH value, L/S, and hydrogen peroxide concentration during reduction leaching on leaching rate of Ni and Co were discussed. The results show that nickel leaching rate is 78.1% and cobalt leaching rate is very low under the condition of pH value of 2.5 during acid-washing. Nickel leaching rate is 98.3% and cobalt leaching rate is 97.5% during reduction leaching under the optimum conditions including L/S of 10︰1, sulfuric acid concentration of 1.5 mol/L, leaching time of 3 h, leaching temperature of 60 ℃, and dosage of hydrogen peroxide of 1.0 mL/g. Key words：purification residues; reduction leaching; nickel; cobalt 我国是钴资源贫乏的国家，镍钴废料中含有丰富的镍钴资源，所以回收镍钴废料中的镍和钴，不但提高了资源的回收利用，也有利于保护环境。对不同的镍钴废料，研究者提出了许多工艺。SADANANDAM等[1-2]采用焙烧酸溶沉淀法工艺回收废旧催化剂中的钴，得到的产品主要是氧化钴。唐新村[3]课题组对分选后的废旧锂电池通过拆解的物理分离手段回收金属铜和金属铝集流体、壳体合金以及隔膜和塑料以及活性物质，通过硫酸酸浸、沉淀以及萃取提纯得到硫酸钴溶液，并以此溶液进一步合成碳酸钴、草酸钴等产品。王多冬[4-5]采用硫酸氧压酸浸工艺回收含钴合金中的有价金属。SHEN Y F等[6-7]采用选择性浸出的方法从湿法冶炼渣中回收镍钴。郭瑞 目前，净化渣通常被堆积在渣厂或做简单处理，用于各种镍钴废料的回收。冶炼厂电解镍除杂得到的镍钴渣料也是一种丰富的镍钴